Abstract
The Mg2Ni alloy was homogenized by a multi-stage heat treatment to assure the single phase, and its protium absorption and desorption characteristics were investigated. The results show that the Mg2Ni alloy containing a small amount of MgNi2 phase can be obtained by the heat treatment just below the peritectic temperature. The PCT curve shows two plateaus of Mg and Mg2Ni in the as-cast specimen. However, the plateau pressure of Mg solid solution is hard to appear in the heat-treated specimen because it is homogenized during the multi-stage heat treatment. Both activated as-cast and heat-treated specimens absorb protium at room temperature. They have higher protium contents than before activation. This phenomenon is caused by new surface formation and an increase in reaction area due to activation. As the elapsed time after taking specimens out from hydrogen atmosphere increases, the protium desorption temperature decreases and desorbed protium content increases. The decrease in desorption temperature is caused by a decrease in microtwinning in Mg2NiH4 low temperature phase. Also, grinding the powder of the hydride leads to similar improvement of hydrogen desorbing characteristics.
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